the early 1970s, the two rates differed no more than a single percentage point.
This "convergence" of the rates, Greenberg maintains, had little to do with air and water pollution. Medical wisdom now links outdoor pollu- tion to only one percent of all U.S. cancers; tobacco smoking, eating fatty foods and other nutritional factors, and exposure to carcinogens in the workplace are responsible for 60 to 90 percent of all cancer deaths in America. By the time NCI had released its report,...